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Siemens 3RT2046-3KB40 — Contactors

Siemens 3RT2046-3KB40 SIRIUS Coupling Contactor, 24 VDC Coil

MPN3RT2046-3KB40
Active

Siemens SIRIUS coupling contactor, 24 VDC coil, S3 size, 70 mm wide, spring-type terminals, screw and snap-on DIN rail mounting.

$223.52Ref. price · indicative, final on quote
Siemens 3RT2046-3KB40 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

3RT2046-3KB40 — Identification
ParameterValue
Contactor frame sizeS3
3RT2046-3KB40 — Ratings & Performance
ParameterValue
Rated operational current, AC-12, max.10 A
Rated operational current, AC-4 @ 400 V80 A
Rated value @ 400 V3 A
Rated value @ 500 V2 A
Rated value @ 690 V1 A
Rated value @ 230 V20 hp
Rated value @ 24 V10 A
Rated value @ 60 V2 A
Rated value @ 110 V1 A
Rated value @ 220 V0.3 A
3RT2046-3KB40 — Control & Coil
ParameterValue
Control supply voltage typeDC
3RT2046-3KB40 — Contacts & Poles
ParameterValue
Main poles3
Main NO contacts3
Auxiliary contact reliability1 faulty switching per 100 million (17 V, 1 mA)
3RT2046-3KB40 — Protection & Coordination
ParameterValue
Short-circuit coordination type 1, fusegG: 250 A (690 V, 100 kA), aM: 160 A (690 V, 100 kA), BS88: 200 A (415 V, 80 kA)
Short-circuit coordination type 2, fusegG: 160 A (690 V, 100 kA), aM: 100 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)
Aux. switch short-circuit protection, fusegG: 10 A (500 V, 1 kA)
3RT2046-3KB40 — Connection & Mounting
ParameterValue
Main circuit connectionscrew-type terminals
Aux. / control circuit connectionspring-loaded terminals
Conductor cross-section, solid2.5 ... 16 mm²
Conductor cross-section, solid or stranded2x (0.5 ... 2.5 mm²)
Conductor cross-section, finely stranded w/ ferrule2x (0.5 ... 1.5 mm²)
Mounting methodscrew and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715
Side-by-side mountingYes
3RT2046-3KB40 — Durability
ParameterValue
Durability (operating cycles, typ.)10 000 000
Durability with aux. switch block (cycles, typ.)10 000 000
3RT2046-3KB40 — Environmental
ParameterValue
Operating temperature range-25 ... +60 °C
Storage temperature range-55 ... +80 °C
Installation altitude, max.2 000 m
3RT2046-3KB40 — Mechanical
ParameterValue
Width70 mm
Height140 mm
Depth152 mm
3RT2046-3KB40 — Specifications
ParameterValue
At AC16.3g / 5 ms, 10.g / 10 ms

Product details

The Siemens 3RT2046-3KB40 is a SIRIUS coupling contactor in the S3 frame, built for switching loads in control panels and motor starter assemblies. The 24 VDC coil pulls 2.7 A inrush and holds with a pick-up threshold of 0.8 x rated voltage, dropping out at 1.2 x Uc. Coil terminals are spring-type — no screwdriver needed for the control wiring, which saves time on the panel build.

Clearances and Mounting

The contactor body measures 70 mm wide by 140 mm high by 152 mm deep.

Switching Duty and Life

AC-4 (inching/plugging) maxes at 250 ops/h — if your application needs frequent reversing, that's the limiting curve. Arcing time runs 10 to 20 ms; DC dropout sits between 38 and 57 ms.

Frequently asked questions

What are the key dimensions and clearances for panel integration?

The contactor is 70 mm wide, 140 mm high, and 152 mm deep. Minimum clearances: 10 mm up, 10 mm down, 20 mm forward, 10 mm side. Mounts on 35 mm DIN rail per DIN EN 60715.

What wire sizes does the 3RT2046-3KB40 accept on the main and auxiliary terminals?

Main terminals accept solid wire from 2.5 to 16 mm² and stranded from 6 to 70 mm². Auxiliary terminals accept 2x (0.5 to 2.5 mm²) solid or stranded. Coil terminals are spring-type.

Where can I buy 3RT2046-3KB40 and how is it quoted?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here.

What is the maximum switching frequency for motor loads (AC-3 duty)?

Rated for up to 850 operations per hour in AC-3 duty. For AC-4 (inching/plugging) the maximum is 250 ops/h.

MPN
3RT2046-3KB40